Unformatted text preview: AV node - increases the permeability of AV nodal cells to K+. This reduces the excitability of the AV node and further delays it s atrial contractile cells - shortens the duration of the cardiac fiber action potentials by reducing the Ca++ permeability during the sympathetic - sympathetic nerves supply the atria (the SA and AV nodes), and richly innervate the ventricles. This input, medi a...
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- Fall '08